<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">
        首页
      </el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/params' }">分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片区域-->
    <el-card>
      <el-alert
        title="注意:只允许为第三级分类设置相关参数"
        type="warning" :closable="false" show-icon>
      </el-alert>
      <!--选择商品分类区域-->
      <el-row class="cat_top">
        <el-col>
          <span>选择商品分类:</span>
          <!--选择商品分类的级联选择框-->
          <el-cascader
            ref="cascaderClear"
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
            clearable></el-cascader>
        </el-col>
      </el-row>
      <!--tab 页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数面板-->
        <el-tab-pane label="动态参数" name="many">
          <!--添加参数的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
          </el-button>
          <!--动态参数表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{item}}</el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加的按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showModifyDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性面板-->
        <el-tab-pane label="静态属性" name="only">
          <!--添加属性的按钮-->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
          </el-button>
          <!--静态参数表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{item}}</el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--添加的按钮-->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showModifyDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数的对话框-->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%" :close-on-click-modal="false"
      @close="addDialogClosed">
      <!--添加参数的对话框-->
      <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>

    <!--展示修改对话框-->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="modifyDialogVisible"
      width="50%" :close-on-click-modal="false"
      @close="modifyDialogClosed">
      <!--添加参数的对话框-->
      <el-form ref="modifyFormRef" :model="modifyForm" label-width="100px" :rules="modifyFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="modifyForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="modifyDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="modifyParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: 'Params',
    data() {
      return {
        // 商品分类列表
        catelist: [],
        // 级联选择框的配置对象
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children',
          expandTrigger: 'hover'
        },
        // 级联选择框双向绑定到的数组
        selectedCateKeys: [],
        // 被激活页签名称
        activeName: 'many',
        // 动态参数
        manyTableData: [],
        // 静态属性
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
          attr_name: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        },
        // 控制修改对话框的显示与隐藏
        modifyDialogVisible: false,
        // 修改表单的验证数据对象
        modifyForm: {},
        // 修改表单的验证规则对象
        modifyFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        }
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有的商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        // 把数据列表，赋值给catalist
        this.catelist = res.data
      },
      // 级联选择框选中项变化,会触发这个函数
      handleChange() {
        // 级联选择器被清空时表格数据清空
        /*
        if (this.selectedCateKeys.length === 0) {
          this.manyTableData = []
          this.onlyTableData = []
        }
        */
        this.getParamsData()
      },
      // tab页签点击事件处理函数
      handleTabClick() {
        this.getParamsData()
      },
      // 获取参数的列表数据
      async getParamsData() {
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          // eslint-disable-next-line
          return
        }
        // 证明选中的是三级分类
        // 根据所选分类的Id,和当前所处的面板获取对应的参数
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })

        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          item.inputVisible = false
          item.inputValue = ''
        })
        // 动态参数
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          // 静态参数
          this.onlyTableData = res.data
        }
      },
      // 监听添加参数对话框关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error('添加' + this.titleText + '失败')
          }
          this.$message.success('添加' + this.titleText + '成功')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      // 点击按钮 展示修改对话框
      async showModifyDialog(attrId) {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败!')
        }
        this.modifyForm = res.data
        this.modifyDialogVisible = true
      },
      // 重置修改的表单
      modifyDialogClosed() {
        this.$refs.modifyFormRef.resetFields()
      },
      // 点击按钮 修改参数信息
      modifyParams() {
        this.$refs.modifyFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.modifyForm.attr_id}`, {
            attr_name: this.modifyForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败!')
          }
          this.$message.success(res.meta.msg)
          this.getParamsData()
          this.modifyDialogVisible = false
        })
      },
      // 根据Id删除对应参数
      async deleteParams(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除!')
        }

      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除失败!')
        }
        this.$message.success(res.meta.msg)
        this.getParamsData()
      },
      // 文本框失去焦点 或 按下了Enter键都会触发
      handleInputConfirm (row) {
        // 输入的内容为空时，清空
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 提交数据库，保存修改
        this.saveAttrVals(row)
      },
      showInput (row) {
        row.inputVisible = true
        //   让输入框自动获取焦点
        // $nextTick方法的作用：当页面元素被重新渲染之后，才会至指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 将对attr_vals操作保存到数据库
     async saveAttrVals (row) {
        // 需要发起请求保存这次操作
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${row.attr_id}`,
          {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
          }
          )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数项失败!')
        }
        this.$message.success('修改参数项成功!')
     },
      // 删除对应的参数和选项
      handleClose (i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      }
    },
    computed: {
      // 如果按钮需要被禁用则返回true 否则返回false
      isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
          return true
        }
        return false
      },
      // 当前选中的三级分类Id
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style lang="less" scoped>
  .cat_top {
    margin: 15px 0px
  }

  .el-cascader {
    margin: 0 15px;
  }
  .el-tag{
    margin: 0 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>
